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oil aeration problem

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Old   July 19, 2011, 15:41
Unhappy oil aeration problem
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My problem can be described as three connected volumes. Inlet is located in the first volume and only air flows through it. Then air reachs the second volumen that is filled only with oil. In the end a mixture of air and oil droplets leaves the second volumen into the third volumen. The flow then develops and exits through the outlet. I'm mainly interested in the (air) pressure drop from inlet to oulet due to geometry and oil resistance. I'm using the mixture model with oil as the primary phase and air as the secondary phase. As BC, velocity inlet where I can define turbulence parameters for the mixture and velocity inlet for air and volume fraction for air equal to 1 (no oil through inlet). The other BC is pressure outlet. I've patched the second volumen with volume fraction for air equal to 0 (only oil in the beginning). I would expect air mixing with oil in the seconf volume and then exiting into the third volume and then through the outlet. I don't know if I'm making a big mistake but the problem refuses to converge. Could it be eulerian-eulerian a better modeling choice?Transient problem?
Thank you in advance
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